| /* inet_pton.c -- convert IPv4 and IPv6 addresses from text to binary form |
| |
| Copyright (C) 2006, 2008-2021 Free Software Foundation, Inc. |
| |
| This program is free software: you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 3 of the License, or |
| (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program. If not, see <https://www.gnu.org/licenses/>. */ |
| |
| /* |
| * Copyright (c) 1996,1999 by Internet Software Consortium. |
| * |
| * Permission to use, copy, modify, and distribute this software for any |
| * purpose with or without fee is hereby granted, provided that the above |
| * copyright notice and this permission notice appear in all copies. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS |
| * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE |
| * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL |
| * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR |
| * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS |
| * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS |
| * SOFTWARE. |
| */ |
| |
| #include <config.h> |
| |
| /* Specification. */ |
| #include <arpa/inet.h> |
| |
| #if HAVE_DECL_INET_PTON |
| |
| # undef inet_pton |
| |
| int |
| rpl_inet_pton (int af, const char *restrict src, void *restrict dst) |
| { |
| return inet_pton (af, src, dst); |
| } |
| |
| #else |
| |
| # include <c-ctype.h> |
| # include <string.h> |
| # include <errno.h> |
| |
| # define NS_INADDRSZ 4 |
| # define NS_IN6ADDRSZ 16 |
| # define NS_INT16SZ 2 |
| |
| /* |
| * WARNING: Don't even consider trying to compile this on a system where |
| * sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX. |
| */ |
| |
| static int inet_pton4 (const char *src, unsigned char *dst); |
| # if HAVE_IPV6 |
| static int inet_pton6 (const char *src, unsigned char *dst); |
| # endif |
| |
| /* int |
| * inet_pton(af, src, dst) |
| * convert from presentation format (which usually means ASCII printable) |
| * to network format (which is usually some kind of binary format). |
| * return: |
| * 1 if the address was valid for the specified address family |
| * 0 if the address wasn't valid ('dst' is untouched in this case) |
| * -1 if some other error occurred ('dst' is untouched in this case, too) |
| * author: |
| * Paul Vixie, 1996. |
| */ |
| int |
| inet_pton (int af, const char *restrict src, void *restrict dst) |
| { |
| switch (af) |
| { |
| case AF_INET: |
| return (inet_pton4 (src, dst)); |
| |
| # if HAVE_IPV6 |
| case AF_INET6: |
| return (inet_pton6 (src, dst)); |
| # endif |
| |
| default: |
| errno = EAFNOSUPPORT; |
| return (-1); |
| } |
| /* NOTREACHED */ |
| } |
| |
| /* int |
| * inet_pton4(src, dst) |
| * like inet_aton() but without all the hexadecimal, octal (with the |
| * exception of 0) and shorthand. |
| * return: |
| * 1 if 'src' is a valid dotted quad, else 0. |
| * notice: |
| * does not touch 'dst' unless it's returning 1. |
| * author: |
| * Paul Vixie, 1996. |
| */ |
| static int |
| inet_pton4 (const char *restrict src, unsigned char *restrict dst) |
| { |
| int saw_digit, octets, ch; |
| unsigned char tmp[NS_INADDRSZ], *tp; |
| |
| saw_digit = 0; |
| octets = 0; |
| *(tp = tmp) = 0; |
| while ((ch = *src++) != '\0') |
| { |
| |
| if (ch >= '0' && ch <= '9') |
| { |
| unsigned new = *tp * 10 + (ch - '0'); |
| |
| if (saw_digit && *tp == 0) |
| return (0); |
| if (new > 255) |
| return (0); |
| *tp = new; |
| if (!saw_digit) |
| { |
| if (++octets > 4) |
| return (0); |
| saw_digit = 1; |
| } |
| } |
| else if (ch == '.' && saw_digit) |
| { |
| if (octets == 4) |
| return (0); |
| *++tp = 0; |
| saw_digit = 0; |
| } |
| else |
| return (0); |
| } |
| if (octets < 4) |
| return (0); |
| memcpy (dst, tmp, NS_INADDRSZ); |
| return (1); |
| } |
| |
| # if HAVE_IPV6 |
| |
| /* int |
| * inet_pton6(src, dst) |
| * convert presentation level address to network order binary form. |
| * return: |
| * 1 if 'src' is a valid [RFC1884 2.2] address, else 0. |
| * notice: |
| * (1) does not touch 'dst' unless it's returning 1. |
| * (2) :: in a full address is silently ignored. |
| * credit: |
| * inspired by Mark Andrews. |
| * author: |
| * Paul Vixie, 1996. |
| */ |
| static int |
| inet_pton6 (const char *restrict src, unsigned char *restrict dst) |
| { |
| static const char xdigits[] = "0123456789abcdef"; |
| unsigned char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp; |
| const char *curtok; |
| int ch, saw_xdigit; |
| unsigned val; |
| |
| tp = memset (tmp, '\0', NS_IN6ADDRSZ); |
| endp = tp + NS_IN6ADDRSZ; |
| colonp = NULL; |
| /* Leading :: requires some special handling. */ |
| if (*src == ':') |
| if (*++src != ':') |
| return (0); |
| curtok = src; |
| saw_xdigit = 0; |
| val = 0; |
| while ((ch = c_tolower (*src++)) != '\0') |
| { |
| const char *pch; |
| |
| pch = strchr (xdigits, ch); |
| if (pch != NULL) |
| { |
| val <<= 4; |
| val |= (pch - xdigits); |
| if (val > 0xffff) |
| return (0); |
| saw_xdigit = 1; |
| continue; |
| } |
| if (ch == ':') |
| { |
| curtok = src; |
| if (!saw_xdigit) |
| { |
| if (colonp) |
| return (0); |
| colonp = tp; |
| continue; |
| } |
| else if (*src == '\0') |
| { |
| return (0); |
| } |
| if (tp + NS_INT16SZ > endp) |
| return (0); |
| *tp++ = (u_char) (val >> 8) & 0xff; |
| *tp++ = (u_char) val & 0xff; |
| saw_xdigit = 0; |
| val = 0; |
| continue; |
| } |
| if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) && |
| inet_pton4 (curtok, tp) > 0) |
| { |
| tp += NS_INADDRSZ; |
| saw_xdigit = 0; |
| break; /* '\0' was seen by inet_pton4(). */ |
| } |
| return (0); |
| } |
| if (saw_xdigit) |
| { |
| if (tp + NS_INT16SZ > endp) |
| return (0); |
| *tp++ = (u_char) (val >> 8) & 0xff; |
| *tp++ = (u_char) val & 0xff; |
| } |
| if (colonp != NULL) |
| { |
| /* |
| * Since some memmove()'s erroneously fail to handle |
| * overlapping regions, we'll do the shift by hand. |
| */ |
| const int n = tp - colonp; |
| int i; |
| |
| if (tp == endp) |
| return (0); |
| for (i = 1; i <= n; i++) |
| { |
| endp[-i] = colonp[n - i]; |
| colonp[n - i] = 0; |
| } |
| tp = endp; |
| } |
| if (tp != endp) |
| return (0); |
| memcpy (dst, tmp, NS_IN6ADDRSZ); |
| return (1); |
| } |
| |
| # endif |
| |
| #endif |